Hi Steve,
I have used Kaspersky AV on our seven systems for the last four years or so. I could not be happier with the product.
I would not even consider any Norton, or Symantec product for a few reasons:
Prior to KAV, we had Norton.
One day, I noticed that one of our systems had a flag telling us that our NAV license was about to expire. I clicked to run though an automatic renewal process.
Within a day or two, the same thing happened on a few of our other machines, but only after renewing three or four of them did I notice a problem:
The warning was actually telling us that the licenses were to expire in thirty days, but when we renewed, we received and automatically installed a license that started on the day of the installation.
In other words, Symantec had found a way to "eat" a month of the license.
It was extremely sleazy to say the least.
But that is only part of the problem:
I called Symantec and requested a full refund on our purchases. After some hassling, we got the refund.
But then, removing the products proved to be all but impossible despite using the many "removal" tools Symantec provides.
When the software had been partially removed we started getting frequent error messages relating to a Norton Anti-Worm tool that we had never purchased, and had never installed.
Still, Symantec could not provide a way to remove all traces of their products.
So, I would certainly not purchase one of their products again.
I should also add that (at least in the form we purchase) Kaspersky is very modest in cost when compared to other similar products.
All the best,